Gauge



L. R. PISTOL ES Feb. 2, 1954 GAUGE Filed Oct. 19, 1946 Fig 1 25 INVEN Lfl/VBEAT TOR: R, P/5 7' 01.55

A TTORNE Y Patented Feb. 2, 1954 UNITED STATES PATENT OFFICE GAUGE Lambert R. Pistoles, Wilmington, Del. Application October 19, 1946, Serial No. 704,347

10 Claims. 1

This invention relates to flush pin gages, and more particularly to a gage adapted to be reset from time to time to render it adaptable to change in work pieces requiring gaging, or a change in the permissible tolerance, or both.

Heretofore, in flush-pin gages of the general type referred to, it has been the practice to prepare a new gage for each new dimension requiring gaging, and to discard the gage upon any change, either in the gaged dimension or a change in tolerance.

It is, accordingly, an object of this invention to provide a flush-pin gage, which may be readily set to provide any desired tolerance, and dimension to be gaged, and which may be readily varied, but securely locked, once set.

Another object of the invention is to provide a suitable flush-pin gage which is easily constructed, of light weight, and capable of withstanding the wear and tear of long usage.

Still another object of the invention is to provide a gage which is rugged, and in which fine gradual adjustment may be readily effected and subsequently securely locked.

The above and other novel features of the invention will appear more fully hereinafter from the following detailed description when taken in conjunction with the accompanying drawings. It is expressly understood, however, that the drawings are for illustrative purposes only and are not designed as a definition of the invention, reference being had to the appended claims for this purpose.

In the drawing, wherein like reference characters indicate like parts,

Figure l is a top plan view of a gage constructed in accordance with the invention.

Fig. 2 is a side elevation, with a portion thereof shown in section, the section being taken on the line 2-2 of Fig. 1.

Fig. 3 is a partial section taken substantially on the broken line 33 of Fig. 2.

Fig. l is a section taken substantially on the line 44 of Fig. 2; and

Fig. 5 is a section taken on the lines 55 of either Figl 3 or 1.

Referring to the drawings and more particularly to Figs. 1 and 2, there is illustrated a gage having a main frame member IE having a slidable gage pin i2 mounted therein. The frame member may be of any suitable length, depending on the type of work to which the gage is to be applied. As shown, however, the frame comprises a central pin holding portion M, with extending arms 16 and 20. The under face 9 the frame is finished in a plane hardened surface 24, and if it be desirable to form the frame of light metal such as Duraloy, a hardened steel plate 26 may be affixed to the under side to provide a work engaging plane surface. The arm portions are channeled as at 25 to render the frame light the channeling being effected by milling or any other suitable method.

The central pin holding portion of the frame is provided with a central bore 25, into which are positioned a pair of half sleeves 3B and 32, forming a central aperture 34 within which the round gage pin I2 is free to move. The upper end 36 of the gage pin is provided with a transverse finished surface perpendicular to the axis of the pin, and the lower end is finished with a work engaging surface 38, likewise perpendicular to the pin axis. Each of the half sleeves to and 32 are provided at their upper ends with fiat finished surfaces Lil] and 42 respectively, arranged perpendicular to the axis of the gage pin. By arranging the surfaces M! and 42 in stepped relation to each other with an axial offset equal to the tolerance desired to be maintained and by employing a pin of a length such that its upper end surface 38 lies midway between such stepped surfaces, when the gage pin rests on an accurate- 1y fabricated work piece, the gage operator can quickly ascertain by feel either by finger touch or finger nail, the mid position of the pin end 36, between the stepped surfaces it and 42. The operator can likewise readily determine, with respect to work pieces fabricated within the tolerance limit, as to whether the pin end lies between a position flush with one or the other of the stepped surfaces, by feel.

In order to render such a gage adaptable for gaging differing work pieces, the half sleeves are adjustable in the bore 28, and rigidly held in any adjusted position by the locking bushing and nut M and 46, respectively, riding in a transverse bore 58, intersecting bore 28. Such locking elements are cylindrical and each is provided with a wedge surface 5i] and 52 adapted to bear against a fiat 5 3 in the side of each half sleeve. The wedges are clamped by a machine screw 56 with its head seated upon a shoulder 55 in the bushing, and having its screw threaded shank threaded in a corresponding threaded aperture $9 in the locking nut.

The half sleeves may be formed from steel tube cut lengthwise into halves and may be subsequently ground to size and true circular bore while the finished cut faces of each half are brazed together. Thereafter, the halves may be separated by fusing the brazing bond. The bore 31, will be such as to provide sufficient sliding clearance for the pin, and the innner walls of the half sleeves may be undercut as at 62 to provide a minimum of friction to movement of the The movement of the pin is restricted to any desired range by milling or otherwise providing a transverse slot 64 in the side thereof, for engagement with the tipzend of aset orguide screw 66 angularly inserted --in the frame. The half sleeves are likewise limited in their movement within the bore by the length of the recesses 68 and 1B in the mating edges of the half sleeves, V

on the side opposed to the wedge flats 5t.

In order to assist in the adjustment of :thehalf sleeves and to hold them in ,adiusted position momentarily prior to wedging action of the blocks, a screw and pin arrangement extending through inclined bores 1'2 in the frame, extending into the bore. 28 are provided. The pins bear against a shoulder .lfiformedin each half sleeve at the end-'of an inclinedgroove 13. By adjustment of the screwi-M whichmay have a hexagonal wrench receiving recess 82, thepin will be caused to accuratelyposition its respective sleeve pending wedging andlfinal securing.

In operation, it will be appreciatedthat a range of adjustment of the pin is provided by the length of the slot 64, and that several pins of varying length may be provided for @facilitating gaging of widely differing work pieces. To setthe gage, astandard work piece may be employed, the gage frame faces placed against surfaces -A, A of'the work piece and-thepin allowed to bear against the recess surfacefB of the work piece. The half sleeves are then positioned with their surfaces 4!! and-42 in steppedrelat-ion, the height of the step being determined-bythe tolerance tobe allowed, with the pin surface midway between. After the parts are so .positioned, such adjustments being facilitatedby the adjustment of screws 80 andpins 14,-the locking bushing and nut M and lt are-tightened and then the gage is ready for :use. Once the gage is set fora certain gage dimension, a plate 84, hearing indicia showing the gage setting engraved thereon, may bescrewed in place upon the side faceof the center portion of the frame and covering the locking screw 5E,-to prevent alteration of the gage setting so long as the plate remains so affixed.

While a simple'form'of gage has been illustrated which is adapted to gage depth in work pieces of ,considerable'breadth, the gage being sufiiciently rigid, when extended to a length of 24 inches, or more, it will appear that the frame may take other shapespas maybe requiredby the shape of the work pieces requiring gaging, and the surfaces'between which contact may be established.

Although a single embodimentof the invention has been illustrated anddescribed, it is to be understood that the, invention maybe embodied in various arrangements. Various changes may be made, withoutdeparting from the spirit of the invention as will be-apparent to those skilled in the art and reference shouldtherefore be had to the appended claims for a definition of the limits of the invention.

What is claimed is:

1. In a flush-pin gage, a frame having a work engaging face, an apertureiin theframeextending perpendicular to said face, a pair of semicylinder sleeve members positioned in said apertu e, and ach. having :a-nnished end surface-per- :axial length of the step being equal to the tolerance desired, and in stepped relation to the end of said pin with the pin end midway betweensaidesleeve member ends, when the pin is in accurate gaging ,position.

"2. In a flush-pin gage, a frame, having a work engaging: face, an aperture in the frame extending perpendicular to said face, a pair of semicylinder sleeve members positioned in said aperture-and each having .a finished end surfaceperpendieular to the common sleeve axis, a gagepin reciprocable within said sleeves, and having ,a work engaging end and a finished end face at the other endadapted for flush comparison withsa'id sleeve end faces, means for limiting the free movement of said pin within said sleeves, and means for securing said sleeves within said frame, in fixedposition with the finished ends of said sleeves in stepped relation to each other, the axial length of the step being equal to the tolerance desired, and. in steppedrelation to theend of, said pin, with the pin end midway between said sleeve ends, when the pin is in accurate gaging position.

3. In a flush-pin gage, a frame having a work engagingface, an aperture in the frame extending perpendicular to said face, sleeve means freely slidable within said aperture, a pin slidable in said sleevemeans, fiush-pin gage faces on the end of said pin .and sleeve means, means for at will locking said sleeve means against movement in said frame, screw threaded means within said frame adapted .to gradually shift said sleeve means within said frame, and means vto'limitthe movement of said pin to a range in the order of the diameter of the pin.

4. In a flush-pin gage, a frame having a work engaging face, an aperture in the frame extending perpendicular to said face, sleeve means freely slidable within said aperture, a pin slidable within said sleeve means, flush-pin gage faceson the end of said pin and sleeve means, transverse wedge means arranged in said frame forat will locking said sleeve means against movementin said frame, and. means to limit the movement of said pin to a range in the order of the pin diameter.

'5. In a flush-pin gage, a frame having awork engaging face, an aperture in the frame extending perpendicular to said face, sleeve means freely slidable withinsaid aperture, a gage pin slidable within said sleeve means, flush-pin gage faces on the end of said pin and sleevemeans, and transverse wedge means arranged in said frame for at will locking said sleeve means against movement in said frame.

6. In a pin gage, aframe having an aperture therein and a gaging face, semi sleeves arranged in said aperture havin gage flats on one end, a gage pin slidably mounted within said semi sleeves, and having a flat indicating surface on one end adaptedto cooperate with said gage flats, means for securingsaid semi sleeves with their flats axially spaced by a desired tolerance dimension and with the mid plane between said flats flush with said pin end when the pin is in gaging dimension position.

A flush pin gage comprising a, frame, having an aperture therein, three relatively movable members in said aperture having end faces adapted for flush comparison with one another, two of said members being adapted to be fixed with respect to said frame with their end faces in stepped relation in accordance with a tolerance dimension and with the intermediate plane midway between said stepped end face aligned with the plane assumed by the end face of the third member when positioned at the gaging dimension.

8. In a flush-pin gage, a frame, a gage surface thereon, an aperture in said frame, half sleeve elements in said aperture, a gage pin slidable within said half sleeve elements, means for limiting movement of said pin and sleeves to retain said elements and pin within said frame, flush-pin gaging surfaces on the ends of said pin and elements, means for gradually moving either of said elements relative to the other to create a step relation between the ends of said elements equal to the gage tolerance desired, and transverse wedge locking means for securing said elements rigidly in place.

9. In a flush-pin gage, a frame, a gage surface thereon, an aperture in said frame, half sleeve elements in said aperture, a gage pin slidable within said half sleeve elements, means for limiting movement of said pin and sleeves to retain said elements and pin within said frame, flushpin gaging surfaces on the ends of said pin and elements, means for gradually moving either of said elements relative to the other to create a step relation between the ends of said elements equal to the gage tolerance desired, transverse wedge locking means including a screw threaded part for securing said elements rigidly in place, and means adapted to bear indicia for indicating the gage setting secured to said frame in a position blocking access to said threaded part.

10. A flush pin gage comprising a frame, havin an aperture therein, three relatively movable members in said aperture, two of said members having end faces adapted for comparison with a gaging face of the third, said two of said members being adapted to be fixed with respect to said frame, with their end faces in stepped relation in accordance with a tolerance dimension and with the intermediate plane midway between said stepped end face aligned with the plane assumed by the gaging face of the third member when positioned at the gaging dimen- SlOl'l.

LAMBERT R. PISTOLES.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,253,680 Giern et al. Jan. 15, 1918 1,287,885 Clark Dec. 17, 1918 1,414,750 Roberts May 2, 1922 1,555,632 Brown Sept. 29, 1925 1,602,645 Buckingham Oct. 12, 1926 1,667,809 Kershaw May 1, 1928 2,363,165 Vierling Nov. 21, 1944 2,401,085 La Valley May 28, 1946 ,185 Stoothoff Apr. 5, 1949 FOREIGN PATENTS Number Country Date 74,645 Switzerland Mar. 16, 1917.

OTHER REFERENCES Publ: Machinery, page 911, July 1926. 

